AWS提供了多个解决方案来应对SQS故障,其中包括使用SNS和Lambda函数。具体地,可以使用SNS将消息发送到多个订阅者,同时使用Lambda函数处理和存储消息。当SQS出现故障时,可以将SNS作为备份,并使用Lambda函数来处理消息。这种方法确保即使主要的SQS服务出现故障,也能保证消息的处理和存储的完整性。
以下是使用SNS和Lambda函数解决SQS故障的示例代码:
首先,创建一个SNS主题:
import boto3
sns = boto3.client('sns')
def create_topic(topic_name):
response = sns.create_topic(Name=topic_name)
return response['TopicArn']
topic_arn = create_topic('my-topic')
然后,创建一个Lambda函数来处理和存储消息:
import boto3
import json
sqs = boto3.client('sqs')
dynamodb = boto3.client('dynamodb')
def handler(event, context):
# process and store message
message = json.loads(event['Records'][0]['body'])
# ...
def create_lambda_function(function_name, topic_arn):
iam = boto3.client('iam')
lambda_client = boto3.client('lambda')
# create IAM role
role_name = function_name + '-role'
assume_role_policy_document = {
'Version': '2012-10-17',
'Statement': [{
'Effect': 'Allow',
'Principal': {'Service': 'lambda.amazonaws.com'},
'Action': 'sts:AssumeRole'
}]
}
iam.create_role(RoleName=role_name, AssumeRolePolicyDocument=json.dumps(assume_role_policy_document))
policy_document = {
'Version': '2012-10-17',
'Statement': [{
'Effect': 'Allow',
'Action': ['sqs:DeleteMessage', 'sqs:GetQueueAttributes', 'sqs:ReceiveMessage'],
'Resource': 'arn:aws:sqs:*:*:*'
}, {
'Effect': 'Allow',
'Action': ['dynamodb:PutItem'],
'Resource': 'arn:aws:dynamodb:*:*:table/my-table'
}]
}
iam.put_role_policy(RoleName=role_name, PolicyName=function_name + '-policy', PolicyDocument=json.dumps(policy_document))
# create Lambda function
with open('lambda_function_code.zip', 'rb') as f:
function_code = f.read()
response = lambda_client.create_function(
FunctionName=function_name,
Runtime='python3.7',
Role='arn:aws:iam::*:*:role/' + role_name,
Handler='lambda_function.handler',
Code=dict(ZipFile=function_code),
Description='My Lambda function',
Timeout=300,
MemorySize=128,
Publish=True,
Environment={
'Variables': {
'SQS_QUEUE_URL': 'https://sqs.us-east-1.amazonaws.com/111111111111/my-queue',
'DYNAMODB_TABLE_NAME': 'my-table'
}
}
)
# create subscription
subscription_response = sns.subscribe(
TopicArn=topic_arn,
Protocol='lambda',
Endpoint=response['FunctionArn']
)
return response
最后,创建一个CloudWatch Events规则来触发Lambda函数:
import boto3
cloud